#include <iostream>
#include <fstream>

using namespace std;

class rational
{
private:
    int x, y;
    void simplifica();
public:
    rational (int u=0, int v=1);
    rational (rational &r);
    friend istream &operator>>(istream &is, rational &r);
    friend ostream &operator<<(ostream &os, rational &r);
    friend rational operator+(rational r1, rational r2);
    friend int operator>(rational r1, rational r2);



};

